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Messages - BR549

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5821
General Mach Discussion / Re: Probe wiring
« on: May 30, 2011, 05:03:49 PM »
NOT if they did not bring that signal back throught the plugin. If it is done through the motion card then it really does not need to bring the SIGNAL back to mach. It just needs to provide the info.


Hook it up so that you see the signal on the Ajax side. Then run a G31 probe command and see if it returns the probed positional data.

Just a thought, (;-) TP

5822
When you have a pid loop running and the Speed is called again it resets the controller to what mach thinks the speed should be then the pid takes over and may raise or lower the true speed.

Just a thought(;-) TP

5823
General Mach Discussion / Re: Reset = E-stop?
« on: May 30, 2011, 11:36:12 AM »
WHen running a file and you find a need to stop to correct something:

Hit feedhold and WAIT until Mach stops moving.  (important to maintain xyz positions) IF you hit stop BEFORE mach stops movement you will LOOSE position and will have to rehome

Then Hit STOP, this will clear any activity that MACH is holding for the current program.

Now if you wish to manually edit the Current program then use EDIT to acces the file. Save when done then Mach will reload it and you are ready to proceed.  You can restart from the beginning OR mid program if needed by use of run from here.

NOW IF you need to modify the current program Via CAD/CAM program then CLOSE the current file. This will aloow MACH to release the file so it can be opened elsewhere.

Just a thought, (;-) TP

5824
General Mach Discussion / Re: Spindle probe and edge finding
« on: May 30, 2011, 10:12:06 AM »
That would depend on what you considered cleanest and easiest(;-)  Everyone seems to have a different idea on those points.

Do you want on screen buttons to activate the individual processes.  Would simple macros called from the MDI work?  Do you require SUBs to be called from the Gcode program??

Just a thought, (;-) TP

5825
General Mach Discussion / Re: Mach3 Problems - Rant!!
« on: May 30, 2011, 10:03:36 AM »
There is no real way to pretune the servos they HAVE to be tuned ON THE MACHINE . The proper tuning depends on how the servos respond ON the machine . This accounts for friction, sticktion, weight, inertia,velocity, accel, etc

(;-) TP

5826
Have you tried it???  Notice that it does say it will work(;-)

(;-) TP

5827
I found the document/discussion and posted it here.

http://www.machsupport.com/forum/index.php/topic,18580.new.html#new

Hope it helps, (;-) TP

5828
Documents / Spindle speed setup StepDirection VFD
« on: May 29, 2011, 02:43:24 PM »
VFD:

A VFD takes an output from Mach3 to control its speed. Initially, Mach3
supposes a 1:1 linearty of the result,
which is pretty close to most vfd's in reality, they have allot of electronics
in them to do this on their own. BUT
if the output is not right or not linear as output , then the result is
obviously goign to be off. So the
following steps will do it right, and Id be very interested in any posts of the
results.


Step 1)
Delete the linearity.dat file in your mach3 installation. The
system will recreate it on next startup with 1:1
as the table. Also set the config/pulleys to pulley number 1, with a max speed
of 1000, and a min speed of 0.
This means the range of commandis now S0 to S1000. ( Doesnt matter what the real
speed of your spindle is, use
these numbers to start with.

Step 2)
We now need to know the max speed of the VFD's input, this is the
place most get it wrong. VFDs respond,
as do frequency/analogue convertors to only a specific range typically of input
vs output. SO lets figure out the top
speed expectation of a VFD..

In config/motor tuning, set the spindle axis steps/unit to 60. This means
the velocity slider will now display in hz..
What we need to find out here is both the max frequency of the spindle and
the clip frequency of the VFD.
To do this we now set the velocity slider to max. Youll notice it now reads the
kernal frequency your using. 25000
in 25Khz for example. Apply the settings and exit the dialog.

- Turn on the spindle and set a S1000 as the speed. Measure the true spindle
speed.
- Set a Speed of S950.. then S900, then S850..etc until the spindle actually
slows. What will
happen on many systems is you will still get maximum speed until you lower
the speed to some number..say S750..
or it may happen that the speed instantly start to slow slightly at S950..
Whenever it occurs that the spindle starts to run slower, note the S speed
just prior to the slowdown.

For example, at S1000 I get a true RPM of 3000. SO the following occurs as I do
the series..

S1000 -- 3324RPM
S950 --- 3324 RPM
S900 -- 3324 RPM
S850 -- 3156 RPM

SO the magic number here is S900, the last value where the spindle was at max
RPM.
This shows us that using 90% of the max frequency tells the VFD to go full
out.

So in motor tuning, set the velocity slider down to 90% of the max setting or
current setting in Hz. ( Speed / 10 in % ).

Step 3)

Command a S1000 again, the max speed should still result. ( For higher
accuracy and linearity you can repeat step 2
and vary the velocity slider to the % of the current slider position if you
wish, the more you do step 2, the less change you
shoudl have to make each time. For example if it was at 21600 at this point ,
another run through step 2 might make you change it
to 21250.. each time the change will be less and less. )
Note the current S1000 speed and enter it in the config/pulleys as the max
speed, leave the min speed to 0.

Step 4)

Turn on the spindle and seta speed of S1 . Note the speed you get and
eneter it in the config/pulleys as minimum speed
for that pulley.


OK, so now we have properly set the VFD clip frequency, and the pulley min
and max values. They now take into accoutn the expectation
of the VFD, and the resultant speeds at low and high end to be expected. The
linearity is now considered to be 1:1 for that VFD/freq->analogue conversion.



If you have done this, please post a report of the following run..

Take max speed and divide by 10. Say max speed in pulley max is 2500, so the
increment will be 250. Post for me 10 speeds..

S1 actual RPM: ???
S250 ""
S500 ""
S750 ""
S1000 ""
..etc..

Using this proceedure takes allot fo the guesswork out of
setting up a spindle, forces you to take into
account the VFD clipping limits, forces the setup to show you the outgoing
frequency in hz of the output and should
show us a quantifiable spindle vs command relationship as a result.

Take note, this is for step output spindles, PWM is another matter, this will
still work, but since the number of steps
in speed is dependent on the PWM settings, the end results may be off in a
stepwie fashion if using PWM.

Non-linearity can coem from several directions, frequency->analogue conversion
can be way off a linear scale,
most vfd's will be pretty close to linear if clipping is taken into accoutn as
above. For my part Id appreciate any feedback
on the speed test results after a fresh setup of spindle speed using the above
proceedure. Some may find their max speed
is now higher using this technique, others will find a much more linear
resultant spindle speed, it shoudlnt negatively affect
anyone if done right.

Thanks, and good luck..
Art

5829
Art posted a proceedure to calibrate your spindle .Might want to do a search for it.

(;-) TP

5830
General Mach Discussion / Re: Probe wiring
« on: May 29, 2011, 11:28:56 AM »
From Looking at the Docs I don't think that the probe input is brought back to MACH. It looks as thought it is handled internaly. It states that it only writes the probed values to the DROS and not the internal variables. It also does not use the saved files but relies on YOU to write the values to a file.

I would use the HIGH SPEED port if I were setting it up. IF not when probing at higher speeds you could overrun the trip point and crash the probe. Even at 4000 reads per sec that was slow compared to the LPT which reads at kernal speed.

So I don't think you will SEE the inputs from mach  ?????

Just a thought(;-) TP

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